i bought a SCT handheld tuner with custom tunes for my 1998 4.6 swapped to a 2004 5.4. Retained the 1998 ECM, tuner has all the details about the swap.
Try to program the ECM and get the Unlock ECM Failed error 1019. Contacted the tuner several times, did some trouble shooting and he had me talk to SCT tech. Spoke to 3 different techs, first remotely reformatted the device, second had me check for 18 volts during attempted programming on pin 13 which I had, 3rd tech loaded an older version of firmware none helped so they gave me a RMA number to return the device to check it.
Well today Not confident the device was bad I decided to remove the ECM to take a look at it before I sent back the SCT tomorrow. ECM looked stock and unmolested, I looked under the plate on the back and there was a chip, it says Hyperchip.inc. FL1C28. 10/26/98 I'm guessing this is my problem, what is the fix? New ECM? New stock chip?
I have an email out to the programmer but it is Sunday and wonder what you guys think.
Mike

 

That Hyperchip is not a stock device. Try installing the PCM without it and see if the truck will run. If it does, try programming it with your SCT, without installing the Hyperchip.

I think you are trying to load a program on top of something that is not stock, and that's why things don't work.

- Jack

 

I don't know what stock looks like but this looks like it might replace a stock chip. If that is so then I don't have stock to go back to.
Mike

 

The chip's wiring bypasses some of the stock wiring, so if you remove it you are back to stock. I would try Jack's suggestion.

 

Removed the offending chip.

Truck fired right up, shut it off and succesfully loaded custom tune. Thanks for your help.
Mike